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Tag: Nearly-Zero Energy Buildings

What’s All the Fuss About the Revised Energy Performance of Buildings Directive

The amendment of the Energy Performance of Buildings Directive (EPBD) is one of the most important changes that has occurred in the EU buildings sector in the last 16 years.

Under the revised Energy Performance of Buildings Directive (EPBD):

  • EU countries will have to establish stronger long-term renovation strategies, aiming at decarbonising the national building stocks by 2050, and with a solid financial component.
  • A common European scheme for rating the smart readiness of buildings, optional for Member States, will be introduced.
  • Smart technologies will be further promoted, for instance through requirements on the installation of building automation and control systems and on devices that regulate temperature at room level.
  • E-mobility will be supported by introducing minimum requirements for car parks over a certain size and other minimum infrastructure for smaller buildings.
  • EU countries will have to express their national energy performance requirements in ways that allow cross-national comparisons.
  • Health and well-being of building users will be promoted, for instance through an increased consideration of air quality and ventilation.

Other requirements under the Energy Performance of Buildings Directive include:

  • All new buildings must be nearly zero-energy buildings by 31 December 2020.
  • Energy performance certificates must be issued when a building is sold or rented, and they must also be included in all advertisements for the sale or rental of buildings.
  • EU countries must establish inspection schemes for heating and air conditioning systems or put in place measures with equivalent effect.
  • EU countries must set cost-optimal minimum energy performance requirements for new buildings, for the major renovation of existing buildings, and for the replacement or retrofit of building elements (heating and cooling systems, roofs, walls and so on).
  • EU countries must draw up lists of national financial measures to improve the energy efficiency of buildings.

What is the challenge?

  • The Commission reached an agreement that includes a binding energy efficiency target for the EU for 2030 of 32.5%.
  • The risk of the directive being ineffective is high if countries and local authorities do not enforce it correctly.
  • Around 200 million buildings need to be renovated. EU countries must make energy efficient renovations to at least 3% of the total floor area of buildings owned and occupied by central government.
  • EU governments should only purchase buildings which are highly energy efficient.
  • EU countries must draw up long-term national building renovation strategies which can be included in their National Energy Efficiency Action Plans.
  • Member states are to provide for set system requirements in respect to installation, sizing, adjustment and controls. This applies to heating systems, hot water, air conditioning and large ventilation systems.
  • Cost optimal performance – the integration between cost optimality and high performance technical solutions underpins the deployment of NZEBs.

Overview of Key Changes to TGD L – Dwellings 2019


Technical Guidance Documents are published to accompany each part of the Building Regulations in Ireland indicating how the requirements of that part can be achieved in practice.

Technical Guidance Document L (TGD L) indicates the requirements for Conservation of Fuel and Energy.

A new TGD L is due to be published in 2019. The new document follows a revision of the Energy Performance of Buildings Directive (EPBD). Member States have until March 2020 to translate into national law all the new requirements from the EU energy efficiency legislation affecting buildings.

Draft Transitional Arrangements:

  • NZEB and TGD L 2019 Dwellings to apply to new Dwellings commencing construction from 1st November 2019 subject to transition.
  • Transitional arrangements to allow TGD L 2011 – Dwellings to be used where planning approval or permission has been applied for on or before 31st October 2019 and substantial completion is completed within 1 year i.e. by 31st October 2020.

Overview of key changes to TGD L Dwellings 2019:

  • Introduction of NZEB (Nearly-Zero Energy Building), MPEPC (Maximum Permitted Energy Performance Coefficient)=0.30, MPCPC (Maximum Permitted Carbon Performance Coefficient)=0.35
  • Introduction of Major Renovations to a cost optimal level where technically, economically and functionally feasible
  • Introduction of a Renewable Energy Ratio (RER) of 20% as per ISO EN 52000 (to replace 10kWh/m2 /yr).
  • Reduction of air permeability backstop from 7m3 /hr/m2 to 5m3 /hr/m2
  • Table 1- Reduction of wall and floor backstop U-Value from 0.21W/m2K to 0.18 W/m2K
  • Table 1- Reduction of window backstop U-Value from 1.6 W/m2K to 1.4 W/m2K
  • Inclusion of guidance to avoid overheating in dwellings
  • Par 1.3.2.5 – removal of variation of U-Value with percentage glazing • Introduction of calculation of Ru value for corridors in apartments.

The draft TGD L – Dwellings 2019 can be accessed here.

The current TGD L – Dwellings 2011-2017 can be accessed here.

Minimum BER rating for new houses built in 2019.

Minimum BER Rating for New Houses Built in 2019

 

We are quickly approaching the introduction of Nearly-Zero Energy Buildings (nZEB) standard and once again we are asked to improve the energy performance of buildings.

 

What is a Nearly-Zero Energy Building (nZEB)?

‘Nearly zero-energy building’ means a building that has a very high energy performance. The nearly zero or very low amount of energy required should be covered to a very significant extent by energy from renewable sources, including energy from renewable sources produced on-site or nearby.

When will the new regulations be introduced?

Article 9(1) of Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings requires that all new buildings:

– shall be nearly-zero energy buildings by 31 December 2020;

– occupied and owned by public authorities shall be nearly zero energy buildings after 31 December 2018

A full review of Part L of the Building Regulations is expected to be published very soon, this will include the nZEB standard.

What are the transitional arrangements?

This will be confirmed when the reviewed Part L of the Building Regulations is published.

The draft transitional arrangements required the standard to apply to all new dwellings commencing construction from 1st April 2019 (subject to transition).

Transitional arrangements (draft) will allow Part L-2011 Dwellings to be used when planning permission has been applied for prior to the application date of 1st April 2019 and substantial work * is completed by 31st March 2020.

*The structure of the external walls has been erected.

 

How will compliance with nZEB be demonstrated?

For domestic buildings, compliance will be demonstrated using the DEAP methodology. DEAP is currently being updated to account for NZEB.

For non-domestic buildings, compliance will be demonstrated using the NEAP methodology.

 

Is nZEB standard only for new houses?

No, the new standard applies to Domestic and Non Domestic Buildings.

It also applies to existing buildings (Domestic and Non Domestic) where major renovations take place.

Major Renovation’ means the renovation of a building where more than 25% of the surface area of the building envelope undergoes renovation.

For Existing Non Domestic Buildings this will require that the building is brought up to cost optimal level, which is defined in the building regulations as:

  • Upgrade Heating System more than 15 years’ old
  • Upgrade Cooling and Ventilation Systems more than 15 years’ old
  • Upgrade Lighting more than 15 years old.

For Existing Domestic Buildings, it is proposed that major renovation is typically activated where external wall is renovated. The cost optimal level is a primary energy performance of 125 kWh/m2/yr when calculated using DEAP or upgrade of roof insulation and heating system.

 

What are the BER requirements once nZEB standards are implemented?

This is currently out for public consultation, refer to Department of Housing, Planning and Local Government website for proposed changes to the regulations and DEAP methodology.

For all new builds, it is proposed that nZEB will be equivalent to a 25% improvement in energy performance on the 2011 Building Regulations.

This equates to an energy performance and carbon performance parameter that is 70% better than Ireland’s 2005 standard.

A new Nearly-Zero Energy Building (Dwelling) will typically correspond to an A2 Building Energy Rating (BER).

 

 

Will a new house be more expensive to build from 1st April 2019?

The impact on design and cost is expected to be relatively small.

The projected increase is 1.9% over current construction costs depending on the dwelling archetype and design specification applied.

 

 



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